MCQ
Which of the following acid exist in polymeric form
- ✓$HP{O_3}$
- B${H_4}{P_2}{O_7}$
- C${H_3}P{O_4}$
- DNone of these

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$\begin{array}{*{20}{c}}
{\,\,O} \\
{\,\,||} \\
{C{H_3} - C - OH}
\end{array}$ $\xrightarrow[\Delta ]{{N{H_3}}}A\,\xrightarrow[\Delta ]{{{P_2}{O_5}'}}B$
